Powerful, highly effective
Potent
An enemy, opponent
Adversary
Kindly, charitable
Highly offensive, arousing strong dislike
Obnoxious
Skillful, expert in the use of hands or mind
Adroit
Almighty, having unlimited power or authority
Omnipotent
Spiteful, showing ill will
Malevolent
One who does good to others
Benefactor
Loud and noisy; compelling attention
Vociferous
Able to use both hands equally well; very skillful; deceitful, hypocritical
Ambidextrous
Not able to be wounded or hurt; shielded against an attack
Invulnerable
One who leaves a group, traitorous, unconventional
Renegade
Unselfish, concerned with the welfare of others
Altruistic
To disturb, worry; to trouble by repeated attacks
Harass
Skillful, nimble
Deft
Not affected or hurt by; admitting of no passage or entrance
Impervious
Intended to deceive; entrap; sly
Insidious
Worthy of imitation, serving as a model, commendable
Exemplary
Growing without check, running wild
Rampant
A skillful or ingenious device; a clever trick; trickery
Artifice
Courage in facing difficulties
Fortitude
treacherous cunning, deceit
Guile
Marked by honor; courtesy and courage; knightly
Chivalrous
Stubbornly disobedient, resisting authority
Recalcitrant
The purest essence or form of something; the most typical example
Quintessence